I bought Garry's Mod, but I only have TF2 as a Source game.
My friend and I have installed the same addons but some of mine don't work (Minecraft Swep, Halo Swep, Nuclear Warfare 4)
The only difference is that he has Half Life 2 Episode: 1 + 2
Would they work properly if I bought Half Life 2?
What base do most addons need?